Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecf286bd1887acf…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 02:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ecf5149e790b1c8c702d8790c7b592b1 SHA-1: 2ce402fc4bdff33769bb4a6c0d3637b05bbabf0a SHA-256: eecf286bd1887acfa36f0641038400da27a5a2a08729d12ae99b46abe82dd82e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=is+35+too+old+to+have+a+baby PDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021043009584673499.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d006d2521---bomesadabexun.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/bavatedanarulatesigubu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf220da2a---46665717214.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690fbe92b7---geworepeveje.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/95c5900d4836a48d084d64f9652cc699/bujebenuselumukinepor.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/puzowewemuboxo.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/39229877922.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be2b19bf4---renopudiliwofulodev.pdfIn PDF document text
    • http://unseretochter.ch/images/file/ziteroponenanekar.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/42957b9b14ebd517030fc299cffd525a/25022565733.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cilmf8g2mrcopor5jugg9c7a53/pasimukowuwaxizagadowad.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092972f6d45d---diriv.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160779fbdb281a---dewolajopomabomenit.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/on8p4dsjtd6ffqlh0r9o0p9812/rafibujasikiketefoga.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812613a7562---26590570631.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db007f765d15888a44d44f79e343091c/68338215976.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/26382538274.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/xonod.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c59f1433641---zabiwe.pdfIn PDF document text
    • http://195exim.com/datas/files/43820432573.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/57567064018.pdfIn PDF document text
    • https://yellowstonewildlife.com/liritas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 16812 bytes
SHA-256: 59ab354a640d7249c7d6ed856484e4f195dd85762522531ccb6a4ee3abbba1d1
font_01_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10628 bytes
SHA-256: 574e36fffbb6393360e7b8e50492c7fe00e5672fc7979ad39918be64a5abc61a
font_02_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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